Stat-Talk #3

3 Ways to Tune Sample Sizes

Set Accuracy and Visitors

Select the MDE. Cap the False Positives. Pick Low-Variance Metrics.

Wednesday, May 6, 2026

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60 Mins

Live with Ishan Goel, who built VWO's Stats Engine.

What You'll Learn

Tips to set the right MDE for your test

Picking low-variance metrics that save visitors.

Setting the accuracy by selecting the right alpha (false positive rate).

Understand one sided and two-sided tests.

This Webinar Is For You If

This talk is for you if:

You do not have enough traffic to reach statistical significance.

Many of your winners revert back to mean after they have deployed.

You have been hearing about MDE and are unsure how to set it.

After this talk, you will have a practical understanding of setting the sample size for your tests.

Learn with

Ishan Goel

Built the Stats Engine at VWO

Founder & Educator

Former Head of Data Science

Author

Trained 60 Leaders

Founder & Educator

Former Head of Data Science

Author

Trained 60 Leaders

Hi, I am Ishan Goel, a statistician, educator and founder of Thinking Bell.

I previously led data science research at VWO, where I built VWO's Stats Engine.

Today, I teach experimentation statistics through analogies, simulations, games, doodles and real-world problems, making difficult statistical ideas intuitive and useful.

I have also taught experimentation and statistics to cross-functional teams across product, marketing and data, including a 60-person training programme at The Economist.

My goal is simple: help people reason confidently about experiments without turning them into statisticians.

Stat-Talk #3